src/mesa/state_tracker/st_atom_rasterizer.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28  /*
  29   * Authors:
  30   *   Keith Whitwell <keithw@vmware.com>
  31   */
  32
  33 #include "main/macros.h"
  34 #include "main/framebuffer.h"
  35 #include "main/state.h"
  36 #include "st_context.h"
  37 #include "st_atom.h"
  38 #include "st_debug.h"
  39 #include "st_program.h"
  40 #include "pipe/p_context.h"
  41 #include "pipe/p_defines.h"
  42 #include "cso_cache/cso_context.h"
  43
  44
  45 static GLuint translate_fill( GLenum mode )
  46 {
  47    switch (mode) {
  48    case GL_POINT:
  49       return PIPE_POLYGON_MODE_POINT;
  50    case GL_LINE:
  51       return PIPE_POLYGON_MODE_LINE;
  52    case GL_FILL:
  53       return PIPE_POLYGON_MODE_FILL;
  54    case GL_FILL_RECTANGLE_NV:
  55       return PIPE_POLYGON_MODE_FILL_RECTANGLE;
  56    default:
  57       assert(0);
  58       return 0;
  59    }
  60 }
  61
  62
  63
  64 void st_update_rasterizer( struct st_context *st )
  65 {
  66    struct gl_context *ctx = st->ctx;
  67    struct pipe_rasterizer_state *raster = &st->state.rasterizer;
  68    const struct gl_program *vertProg = ctx->VertexProgram._Current;
  69    const struct gl_program *fragProg = ctx->FragmentProgram._Current;
  70
  71    memset(raster, 0, sizeof(*raster));
  72
  73    /* _NEW_POLYGON, _NEW_BUFFERS
  74     */
  75    {
  76       raster->front_ccw = (ctx->Polygon.FrontFace == GL_CCW);
  77
  78       /* _NEW_TRANSFORM */
  79       if (ctx->Transform.ClipOrigin == GL_UPPER_LEFT) {
  80          raster->front_ccw ^= 1;
  81       }
  82
  83       /*
  84        * Gallium's surfaces are Y=0=TOP orientation.  OpenGL is the
  85        * opposite.  Window system surfaces are Y=0=TOP.  Mesa's FBOs
  86        * must match OpenGL conventions so FBOs use Y=0=BOTTOM.  In that
  87        * case, we must invert Y and flip the notion of front vs. back.
  88        */
  89       if (st->state.fb_orientation == Y_0_BOTTOM) {
  90          /* Drawing to an FBO.  The viewport will be inverted. */
  91          raster->front_ccw ^= 1;
  92       }
  93    }
  94
  95    /* _NEW_LIGHT
  96     */
  97    raster->flatshade = ctx->Light.ShadeModel == GL_FLAT;
  98
  99    raster->flatshade_first = ctx->Light.ProvokingVertex ==
 100                              GL_FIRST_VERTEX_CONVENTION_EXT;
 101
 102    /* _NEW_LIGHT | _NEW_PROGRAM */
 103    raster->light_twoside = _mesa_vertex_program_two_side_enabled(ctx);
 104
 105    /*_NEW_LIGHT | _NEW_BUFFERS */
 106    raster->clamp_vertex_color = !st->clamp_vert_color_in_shader &&
 107                                 ctx->Light._ClampVertexColor;
 108
 109    /* _NEW_POLYGON
 110     */
 111    if (ctx->Polygon.CullFlag) {
 112       switch (ctx->Polygon.CullFaceMode) {
 113       case GL_FRONT:
 114          raster->cull_face = PIPE_FACE_FRONT;
 115          break;
 116       case GL_BACK:
 117          raster->cull_face = PIPE_FACE_BACK;
 118          break;
 119       case GL_FRONT_AND_BACK:
 120          raster->cull_face = PIPE_FACE_FRONT_AND_BACK;
 121          break;
 122       }
 123    }
 124    else {
 125       raster->cull_face = PIPE_FACE_NONE;
 126    }
 127
 128    /* _NEW_POLYGON
 129     */
 130    {
 131       if (ST_DEBUG & DEBUG_WIREFRAME) {
 132          raster->fill_front = PIPE_POLYGON_MODE_LINE;
 133          raster->fill_back = PIPE_POLYGON_MODE_LINE;
 134       }
 135       else {
 136          raster->fill_front = translate_fill( ctx->Polygon.FrontMode );
 137          raster->fill_back = translate_fill( ctx->Polygon.BackMode );
 138       }
 139
 140       /* Simplify when culling is active:
 141        */
 142       if (raster->cull_face & PIPE_FACE_FRONT) {
 143          raster->fill_front = raster->fill_back;
 144       }
 145
 146       if (raster->cull_face & PIPE_FACE_BACK) {
 147          raster->fill_back = raster->fill_front;
 148       }
 149    }
 150
 151    /* _NEW_POLYGON
 152     */
 153    if (ctx->Polygon.OffsetPoint ||
 154        ctx->Polygon.OffsetLine ||
 155        ctx->Polygon.OffsetFill) {
 156       raster->offset_point = ctx->Polygon.OffsetPoint;
 157       raster->offset_line = ctx->Polygon.OffsetLine;
 158       raster->offset_tri = ctx->Polygon.OffsetFill;
 159       raster->offset_units = ctx->Polygon.OffsetUnits;
 160       raster->offset_scale = ctx->Polygon.OffsetFactor;
 161       raster->offset_clamp = ctx->Polygon.OffsetClamp;
 162    }
 163
 164    raster->poly_smooth = ctx->Polygon.SmoothFlag;
 165    raster->poly_stipple_enable = ctx->Polygon.StippleFlag;
 166
 167    /* _NEW_POINT
 168     */
 169    raster->point_size = ctx->Point.Size;
 170    raster->point_smooth = !ctx->Point.PointSprite && ctx->Point.SmoothFlag;
 171
 172    /* _NEW_POINT | _NEW_PROGRAM
 173     */
 174    if (ctx->Point.PointSprite) {
 175       /* origin */
 176       if ((ctx->Point.SpriteOrigin == GL_UPPER_LEFT) ^
 177           (st->state.fb_orientation == Y_0_BOTTOM))
 178          raster->sprite_coord_mode = PIPE_SPRITE_COORD_UPPER_LEFT;
 179       else
 180          raster->sprite_coord_mode = PIPE_SPRITE_COORD_LOWER_LEFT;
 181
 182       /* Coord replacement flags.  If bit 'k' is set that means
 183        * that we need to replace GENERIC[k] attrib with an automatically
 184        * computed texture coord.
 185        */
 186       raster->sprite_coord_enable = ctx->Point.CoordReplace &
 187          ((1u << MAX_TEXTURE_COORD_UNITS) - 1);
 188       if (!st->needs_texcoord_semantic &&
 189           fragProg->info.inputs_read & VARYING_BIT_PNTC) {
 190          raster->sprite_coord_enable |=
 191             1 << st_get_generic_varying_index(st, VARYING_SLOT_PNTC);
 192       }
 193
 194       raster->point_quad_rasterization = 1;
 195    }
 196
 197    /* ST_NEW_VERTEX_PROGRAM
 198     */
 199    if (vertProg) {
 200       if (vertProg->Id == 0) {
 201          if (vertProg->info.outputs_written &
 202              BITFIELD64_BIT(VARYING_SLOT_PSIZ)) {
 203             /* generated program which emits point size */
 204             raster->point_size_per_vertex = TRUE;
 205          }
 206       }
 207       else if (ctx->API != API_OPENGLES2) {
 208          /* PointSizeEnabled is always set in ES2 contexts */
 209          raster->point_size_per_vertex = ctx->VertexProgram.PointSizeEnabled;
 210       }
 211       else {
 212          /* ST_NEW_TESSEVAL_PROGRAM | ST_NEW_GEOMETRY_PROGRAM */
 213          /* We have to check the last bound stage and see if it writes psize */
 214          struct gl_program *last = NULL;
 215          if (ctx->GeometryProgram._Current)
 216             last = ctx->GeometryProgram._Current;
 217          else if (ctx->TessEvalProgram._Current)
 218             last = ctx->TessEvalProgram._Current;
 219          else if (ctx->VertexProgram._Current)
 220             last = ctx->VertexProgram._Current;
 221          if (last)
 222             raster->point_size_per_vertex =
 223                !!(last->info.outputs_written &
 224                   BITFIELD64_BIT(VARYING_SLOT_PSIZ));
 225       }
 226    }
 227    if (!raster->point_size_per_vertex) {
 228       /* clamp size now */
 229       raster->point_size = CLAMP(ctx->Point.Size,
 230                                  ctx->Point.MinSize,
 231                                  ctx->Point.MaxSize);
 232    }
 233
 234    /* _NEW_LINE
 235     */
 236    raster->line_smooth = ctx->Line.SmoothFlag;
 237    if (ctx->Line.SmoothFlag) {
 238       raster->line_width = CLAMP(ctx->Line.Width,
 239                                  ctx->Const.MinLineWidthAA,
 240                                  ctx->Const.MaxLineWidthAA);
 241    }
 242    else {
 243       raster->line_width = CLAMP(ctx->Line.Width,
 244                                  ctx->Const.MinLineWidth,
 245                                  ctx->Const.MaxLineWidth);
 246    }
 247
 248    raster->line_stipple_enable = ctx->Line.StippleFlag;
 249    raster->line_stipple_pattern = ctx->Line.StipplePattern;
 250    /* GL stipple factor is in [1,256], remap to [0, 255] here */
 251    raster->line_stipple_factor = ctx->Line.StippleFactor - 1;
 252
 253    /* _NEW_MULTISAMPLE */
 254    raster->multisample = _mesa_is_multisample_enabled(ctx);
 255
 256    /* _NEW_MULTISAMPLE | _NEW_BUFFERS */
 257    raster->force_persample_interp =
 258          !st->force_persample_in_shader &&
 259          raster->multisample &&
 260          ctx->Multisample.SampleShading &&
 261          ctx->Multisample.MinSampleShadingValue *
 262          _mesa_geometric_samples(ctx->DrawBuffer) > 1;
 263
 264    /* _NEW_SCISSOR */
 265    raster->scissor = !!ctx->Scissor.EnableFlags;
 266
 267    /* _NEW_FRAG_CLAMP */
 268    raster->clamp_fragment_color = !st->clamp_frag_color_in_shader &&
 269                                   ctx->Color._ClampFragmentColor;
 270
 271    raster->half_pixel_center = 1;
 272    if (st->state.fb_orientation == Y_0_TOP)
 273       raster->bottom_edge_rule = 1;
 274    /* _NEW_TRANSFORM */
 275    if (ctx->Transform.ClipOrigin == GL_UPPER_LEFT)
 276       raster->bottom_edge_rule ^= 1;
 277
 278    /* ST_NEW_RASTERIZER */
 279    raster->rasterizer_discard = ctx->RasterDiscard;
 280
 281    if (st->edgeflag_culls_prims) {
 282       /* All edge flags are FALSE. Cull the affected faces. */
 283       if (raster->fill_front != PIPE_POLYGON_MODE_FILL)
 284          raster->cull_face |= PIPE_FACE_FRONT;
 285       if (raster->fill_back != PIPE_POLYGON_MODE_FILL)
 286          raster->cull_face |= PIPE_FACE_BACK;
 287    }
 288
 289    /* _NEW_TRANSFORM */
 290    raster->depth_clip = !ctx->Transform.DepthClamp;
 291    raster->clip_plane_enable = ctx->Transform.ClipPlanesEnabled;
 292    raster->clip_halfz = (ctx->Transform.ClipDepthMode == GL_ZERO_TO_ONE);
 293
 294    cso_set_rasterizer(st->cso_context, raster);
 295 }